I strongly recommend not using poison on the rats, as many many pets fall victim.
Is there a have-a-heart trap small enough for rats? I have one for possums, but it would not work on rats.
I know there are critter lovers out there, but the world really does not needcare and preservation of rats. Ther will find their ways back to "civilization," as they flourish there.
I have given out quarters for Halloween for years; the kids love it, and I don't have to have candy in the house, which I WILL get into ...